What this means is that mail sent to any user @abc.com will be delivered to "gwia1.abc.com" or "gwia3.abc.com" first as the preference weighting for both is 10, if both of those gateways are unavailable, then it will delivered to "gwia2.abc.com".

In Gw 5.5 with Internet Addressing enabled, you can have system level GWIA and domain level GWIA. Domain GWIA always override system setting. So for outbound mail you can specific which GWIA is to be used for which domain.

Normally DNS settings are handled by an ISP so check with your ISP for this

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